<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="http://www.tmooc.cn">
  <!--placeholder占位文本 value设置默认值 maxlength最大字符长度-->
    用户名:<input type="text" name="username" maxlength="5" value="tom"
             placeholder="请输入用户名"  readonly><br><!--readonly="readonly"  readonly可以省略-->
    密码:<input type="password" name="password" placeholder="请输入密码"><br>
    <input type="radio" name="gender" value="m" id="r1">
    <label for="r1">男</label>
    <input type="radio" name="gender" checked value="w" id="r2">
    <label for="r2">女</label><br>
    兴趣爱好:<input type="checkbox" name="hobby" value="cy">抽烟
    <input type="checkbox" name="hobby" value="hj">喝酒
    <input type="checkbox" name="hobby" value="tt">烫头<br>
    生日:<input type="date" name="birthday"><br>
    靓照:<input type="file" name="pic"><br>
    所在地:<select name="city">
            <option value="bj">北京</option>
            <option value="sh">上海</option>
            <option value="gz" selected>广州</option>
          </select><br>
    <!--提交按钮-->
    <input type="submit" value="注册">
    <!--重置按钮-->
    <input type="reset" >
    <!--自定义按钮-->
    <input type="button" value="自定义按钮">

    <button type="submit">提交</button>
    <button type="reset">重置</button>
    <button type="button">自定义按钮</button>


</form>

</body>
</html>